IIRC she said she's a return policy abuser, so the cosplays don't really cost much in the long run.
According to insider sources, her parents are pretty loaded but not super involved, so probably not doing much beyond covering rent and food which is basically everything for a NEET, simp bux are probably enough to cover the rest of her lifestyle.
She hasn't mentioned her BF in like 5 years so no clue if they're even still together, wouldn't be surprised if antidepressants killed her sex life and they split over that, I can't imagine she's a great GF outside of the tits.
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Agreed on the point about her content output being underwhelming but I don't think she has any motivation to change that, especially if she doesn't need the money for her current lifestyle. She could definitely stand to get a bit more suggestive with her work though, one thing that really stood out in her older videos is how incredibly jiggly she is with every small movement, but she hasn't really been taking advantage of that lately.